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Page 1 Revised 11/30/11 <br />J:\Eng14\140265\DWG\Exhibits\16_0421 Maintenance Exhibits for RWC\PDF\SWM\APPENDIX C\WORD\F.1-BioretentionTemplate.doc <br />Bioretention Area1 Maintenance Plan for <br />Design Tech Charter School <br />June 3, 2016 <br />The property contains 6 bioretention area(s), located as described below and as shown in <br />the attached C6.0 & C6.1 Stormwater Management Plan. <br />§Bioretention Area No. 1 is located within DMA-00 & DMA-01, southwest of the parking lot. <br />§Bioretention Area No. 2 is located within DMA-02, northwest of the school. <br />§Bioretention Area No. 3 is located within DMA-03, northwest of the school. <br />§Bioretention Area No. 4 is located within DMA-08, northeast of the school. <br />§Bioretention Area No. 5 is located within DMA-13, southeast of the school. <br />§Bioretention Area No. 6 is located within DMA-18, north of the BCDC parking area. <br />I.Routine Maintenance Activities <br />The principal maintenance objective is to prevent sediment buildup and clogging, which <br />reduces pollutant removal efficiency and may lead to bioretention area failure. Routine <br />maintenance activities, and the frequency at which they will be conducted, are shown in <br />Table 1. <br />Table 1 <br />Routine Maintenance Activities for Bioretention Areas <br />No.Maintenance Task Frequency of Task <br />1 Remove obstructions, debris and trash from bioretention <br />area and dispose of properly. <br />Monthly, or as needed after storm <br />events <br />2 Inspect bioretention area to ensure that it drains between <br />storms and within five days after rainfall. <br />Monthly, or as needed after storm <br />events <br />3 Inspect inlets for channels, soil exposure or other <br />evidence of erosion. Clear obstructions and remove <br />sediment. <br />Monthly, or as needed after storm <br />events <br />4 Remove and replace all dead and diseased vegetation.Twice a year <br />1 Bioretention areas include linear treatment measures designed to filter water through biotreatment soils. A bioretention <br />area that has no waterproof liner beneath it and has a raised underdrain in the underlying rock layer to promote <br />infiltration, as shown in Section 6.1 of the C.3 Technical Guidance, may also be called a “bioinfiltration area”. <br />Project Address and Cross Streets <br />275 Oracle Parkway, Redwood City, CA 94065 <br />Assessor’s Parcel No.: 095-040-999 <br />Property Owner: Oracle America Inc. <br />Phone No.: <br />Designated Contact: <br />Phone No.: <br />Mailing Address: 500 Oracle Parkway 5OP-8 <br />Redwood Shores, CA 94065 <br />Bioretention areas function as soil and plant - <br />based filtration devices that remove pollutants <br />through a variety of physical, biological, and <br />chemical treatment processes. These facilities <br />normally consist of a grass buffer strip, sand bed, <br />ponding area, organic layer or mulch layer, <br />planting soil, and plants. <br />Exhibit "A-4" <br />ATTY/AGR/2016.160/CENTRUM OWNERS ASSOCIATION - STMMA <br />REV: 06-22-16 JS <br />6.1.K. - Page 67